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    SubjectRe: [PATCH for 2.5] preemptible kernel
    On Wed, 21 Mar 2001, Keith Owens wrote:
    > I misread the code, but the idea is still correct. Add a preemption
    > depth counter to each cpu, when you schedule and the depth is zero then
    > you know that the cpu is no longer holding any references to quiesced
    > structures.

    A task that has been preempted is on the run queue and can be
    rescheduled on a different CPU, so I can't see how a per-CPU counter
    would work. It seems to me that you would need a per run queue
    counter, like the example I gave in a previous posting.

    Nigel Gamble
    Mountain View, CA, USA.

    MontaVista Software

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